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Reports calls to <code>java.lang.String.concat()</code>.
<p>
  Such calls can be replaced with the <code>+</code> operator for clarity and possible increased
  performance if the method was invoked on a constant with a constant argument.</p>
<p><b>Example:</b></p>
<pre><code>
  String foo(String name) {
    return name.concat("foo");
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  String foo(String name) {
    return name + "foo";
  }
</code></pre>
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